X0508 4 2025-12-11 0 0001156375 CME GROUP INC. CME 0001212809 DUFFY TERRENCE A 20 S. WACKER DRIVE CHICAGO IL 60606 1 1 0 0 Chairman and CEO 0 Common Stock Class A 2025-12-11 4 S 0 13089 269.10 D 77715 D Common Stock Class A 2025-12-11 4 S 0 11911 270.05 D 65804 D On December 11, 2025, Mr. Duffy sold an aggregate of 25,000 shares of CME Group Class A common stock. For reporting purposes, the sale prices within $1 range have been aggregated and the weighted average has been reported. The price range was $268.66 to $269.66 for 13,809 shares and $269.68 to $270.51 for 11,911 shares. The Company maintains a record of the transaction and copies will be provided upon request. By: Margaret Austin Wright For: Terrence A. Duffy 2025-12-15